A multi-wavelength integrated PON ONU transmitting TO-CAN and multi-mode ONU BOSA

Abstract

The utility model discloses a kind of multi-wavelength integrated PON ONU emission TO-CAN and multimode ONU BOSA, integrated emission TO-CAN includes a multi-wavelength integrated integrated laser chip, and multi-wavelength integrated integrated laser chip can output multiple emission wavelengths on the same coupling light path.The utility model further discloses a kind of single light path receiving scheme applied to PON ONU, cooperate integrated integrated emission TO-CAN, form a kind of new PON ONU BOSA.By using multi-wavelength laser chip and TO packaging technology, and single light path receiving scheme, reduce the cost of Combo ONU, further promote Combo ONU widely used in client, simplify the BOSA packaging process of Combo ONU, reduce the components required for multiple light source independent packaging.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, specifically to an integrated transmission TO-CAN and its application in PON ONUBOSA. Background Technology

[0002] With the widespread adoption of fiber optic access networks as a next-generation broadband solution, users are provided with a high-bandwidth, full-service access platform. FTTH (Fiber To The Home), in particular, is considered the most ideal service-transparent network and the ultimate solution for access network development.

[0003] Among various options, the point-to-multipoint (P2MP) fiber optic access method, PON (Passive Optical Network), is the best choice. PON is a network used in access networks where the central office equipment (OLT) and multiple user terminal equipment (ONU / ONT) are connected via a passive optical distribution network (ODN) composed of optical cables, optical splitters / combiners, etc. The key to its "passive" nature is that the ODN between the OLT and ONUs is an optical access network without any active electronic devices. This "passive" characteristic allows PON, a pure media network, to avoid electromagnetic interference and lightning strikes from external equipment, reducing line and external equipment failure rates, improving system reliability, and simultaneously reducing maintenance costs.

[0004] PON systems have undergone rapid iterative development from the initial low-speed EPON / GPON to the 10G-PON currently being deployed on a large scale globally. The industry is now promoting the application of next-generation 25G and 50G-PON, while simultaneously exploring higher-speed solutions.

[0005] Due to the large and diverse user base of PON networks, the coexistence requirement of low-speed and high-speed ONUs must be met within the same PON system. For example, next-generation high-speed PON systems (25G or 50G, referred to as 25G / 50G in this invention) need to be backward compatible with 10G and low-speed PON ONUs. Figure 1 As shown, the next-generation high-speed 25G / 50G PON OLT 11 requires complex optical modules 15, including two or more generations of optical transmission and reception capabilities (e.g., high-speed Tx / Rx 101, 10G Tx / Rx 102, and low-speed Tx / Rx 103). Communication services are provided to the low-speed EPON or GPONOUN 13, the 10G PON ONU 14, and the high-speed 25G / 50G-PON ONU 15 via optical splitter 12.

[0006] The coexistence of ONUs with different speeds not only places high demands on the OLT, but also requires operators to manage optical modems of different speeds during network upgrades, resulting in higher costs. To enhance smooth network upgrades and improve the broadband customer experience, operators have begun adopting a new type of ONU that is compatible with both GPON and XGPON functions. This allows for flexible customer service during OLT upgrades without the need for on-site replacement of new optical modems. This multi-functional ONU, also known as a Combo ONU, needs to be able to transmit and receive at two wavelengths. A schematic diagram of the Combo ONU optical device structure is shown below. Figure 2 The ONU includes a 2.5G 1270nm transmitter (TO 21), a 1.25G 1310nm transmitter (TO 22), a 10G 1577nm receiver (TO 23), and a 2.5G 1490nm receiver (TO 24). The emergence of Combo ONUs brings convenience to operators in network upgrades and management. However, ONU applications are extremely cost-sensitive; traditional packaging methods require two independently packaged transmitters, resulting in complex packaging and high costs.

[0007] In summary, to meet the network requirements for coexistence, the OLT needs to be backward compatible with low-speed PON ONUs. In 10G-PON deployment, the OLT needs to be compatible with two generations, covering ONUs for XG and GPON. When deploying higher-speed PON systems such as 25G or 50G in the future, the OLT needs to be compatible with three generations, covering ONUs for 25 / 50G, XG-PON and GPON. At the same time, due to the requirement for smooth network upgrades, the deployment of multi-functional Combo ONUs by clients is also inevitable. The above traditional solutions have the following technical problems: (1) The complexity of OLT optical modules increases dramatically. For example, the three-generation compatibility required for 50G-PON causes problems such as cost, power consumption and size, which is not conducive to mass deployment; (2) Combo ONUs that work in both XG and GPON modes require two independent light sources and separate packaging. The optical devices need to adopt a 4 TO solution similar to OLT BOSA, which keeps the cost high; (3) The higher-speed 25G / 50G PON ONUs support multi-mode operation, and the overall cost of optical components is even higher. Utility Model Content

[0008] To address at least one of the aforementioned problems, this invention proposes an integrated TO-CAN transmitter for PON ONUs, which simplifies the packaging process of PON ONUs and reduces their cost.

[0009] To achieve the above objectives, this utility model provides an integrated transmission TO-CAN for PON ONU, which includes a multi-wavelength integrated laser chip capable of outputting two transmission wavelengths, 1270nm and 1310nm, on the same coupled optical path.

[0010] This invention also provides a Combo ONU BOSA, which includes an integrated transmit TO-CAN as described above, and two RX-TOs for receiving downlink 1577nm signals and downlink 1490nm signals respectively; or the Combo ONU BOSA includes an integrated transmit TO-CAN as described above, and a dual-optical-path dual-receive RX-TO for receiving downlink 1577nm signals and downlink 1490nm signals.

[0011] Preferably, the Combo ONU BOSA further includes a TX-TO for providing an uplink 1286nm signal and an RX-TO for receiving a downlink 1342nm signal.

[0012] This utility model also provides a multi-mode ONU BOSA, which includes an integrated transmit TO-CAN as described above, and an RX-TO for receiving downlink 1577nm signals and downlink 1490nm signals. The RX-TO adopts a single optical path dual-rate design.

[0013] This invention also provides a multi-mode ONU BOSA, which includes an integrated transmit TO-CAN as described above, a TX-TO for providing uplink 1286nm signals, and a first RX-TO for receiving downlink 1577nm, 1490nm, and 1342nm signals, wherein the first RX-TO adopts a single-path three-rate design; or, the multi-mode ONU BOSA includes an integrated transmit TO-CAN as described above, a TX-TO for providing uplink 1286nm signals, a second RX-TO for receiving downlink 1342nm signals, and a third RX-TO for receiving downlink 1577nm and 1490nm signals, wherein the third RX-TO adopts a single-path dual-rate design.

[0014] This invention also provides an integrated transmission TO-CAN for PON ONU, which includes a multi-wavelength integrated laser chip that can output two transmission wavelengths, 1286nm and 1270nm, on the same coupled optical path.

[0015] This invention also provides a Combo ONU BOSA, which includes an integrated transmit TO-CAN as described above, and two RX-TOs for receiving downlink 1342nm signals and downlink 1577nm signals respectively; or the Combo ONU BOSA includes an integrated transmit TO-CAN as described above, and a dual-optical-path dual-receive RX-TO for receiving downlink 1342nm signals and downlink 1577nm signals.

[0016] Preferably, the Combo ONU BOSA also includes a TX-TO for providing an uplink 1310nm signal and an RX-TO for receiving a downlink 1490nm signal.

[0017] This utility model also provides a multi-mode ONU BOSA, which includes an integrated transmit TO-CAN as described above, and an RX-TO for receiving downlink 1342nm signals and downlink 1577nm signals. The RX-TO adopts a single optical path dual-rate design.

[0018] This invention also provides a multi-mode ONU BOSA, which includes an integrated transmit TO-CAN as described above, a TX-TO for providing uplink 1310nm signals, and a fourth RX-TO for receiving downlink 1342nm, 1577nm, and 1490nm signals, wherein the fourth RX-TO adopts a single-optical-path three-rate design; or, the multi-mode ONU BOSA includes an integrated transmit TO-CAN as described above, a TX-TO for providing uplink 1310nm signals, a fifth RX-TO for receiving downlink 1342nm signals, and a sixth RX-TO for receiving downlink 1577nm and 1490nm signals, wherein the sixth RX-TO adopts a single-optical-path dual-rate design.

[0019] This invention also provides an integrated transmission TO-CAN for PON ONU, which includes a multi-wavelength integrated laser chip that can output three transmission wavelengths of 1286nm, 1270nm and 1310nm on the same coupled optical path.

[0020] This invention also provides a Combo ONU BOSA, which includes an integrated transmit TO-CAN as described above, and three RX-TOs for receiving downlink 1342nm signals, downlink 1577nm signals and downlink 1490nm signals, respectively.

[0021] This invention also provides a multi-mode ONU BOSA, which includes an integrated transmit TO-CAN as described above, and a seventh RX-TO for receiving downlink 1342nm signals, downlink 1577nm signals, and downlink 1490nm signals, wherein the seventh RX-TO adopts a single-optical-path three-rate design; or, the multi-mode ONU BOSA includes an integrated transmit TO-CAN as described above, an eighth RX-TO for receiving downlink 1342nm signals, and a ninth RX-TO for receiving downlink 1577nm signals and downlink 1490nm signals, wherein the ninth RX-TO adopts a single-optical-path dual-rate design.

[0022] The beneficial effects of this utility model are as follows: (1) By adopting multi-wavelength laser chips and TO packaging technology, this utility model reduces the cost of Combo ONU, further promotes the widespread use of Combo ONU in customers, and simplifies the upgrade and management of operator FTTX networks.

[0023] (2) The BOSA packaging process of Combo ONU has been simplified, reducing the number of components such as multiplexers, CAPs, and sockets required for independent packaging of multiple light sources. Combo ONU BOSA has been changed from the traditional 4 TO package to a 3 TO package, which greatly reduces the cost.

[0024] (3) A novel multi-mode ONU BOSA is proposed, which uses a multi-wavelength laser and TO packaging. At the same time, the receiver adopts a novel single-optical-path dual-rate TO packaging, which enables the ONU to be compatible with multiple working modes such as GPON, XG-PON, and XGS-PON. When upgrading to higher speed 25G or 50G-PON, there is no need to be backward compatible with two generations of ONUs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a PON coexistence architecture; Figure 2 This is a schematic diagram of a traditional Combo ONU structure; Figure 3 This is a schematic diagram of the integrated TX-TO structure based on a dual-wavelength integrated direct modulation laser chip proposed in this utility model. Figure 4 This is a schematic diagram of the Combo ONU BOSA structure in Example 1; Figure 5 This is a schematic diagram of an integrated dual-receiver TO optical path; Figure 6 This is a simplified diagram of a coexistence architecture; Figure 7 This is a schematic diagram of the multi-mode ONU BOSA structure in Example 2; Figure 8 This is a schematic diagram of the dual-optical-path receiving optical path of a traditional Combo ONU; Figure 9 This is a schematic diagram of the single-optical-path receiving optical path in Embodiment 2; Figure 10 This is a schematic diagram of a PON coexistence architecture that does not require a Combo OLT to achieve coexistence. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] TO-CAN, as a low-cost coaxial packaging method for lasers, is widely used in the optical communication industry. However, due to space and shape limitations, traditional TO can only package one laser chip, supporting only one communication wavelength. Figure 3As shown, this invention proposes an integrated emission TO-CAN 31, which includes a 1270nm / 1310nm dual-wavelength integrated direct modulation laser (DML) chip 301, a backlight detector (MPD), a dual-wavelength integrated TO socket 302, and a socket cap. This novel integrated emission TO-CAN 31 can output two emission wavelengths, 1270nm and 1310nm, on the same coupled optical path, saving an additional set of TO materials compared to traditional independently packaged emission. The dual-wavelength integrated DML chip 301 can be any other known laser chip, as long as it enables the integrated emission TO-CAN 31 to output two emission wavelengths on the same coupled optical path. This invention does not limit the structure of the integrated laser chip; for example, it can be entirely DML or EML (electro-absorption modulated laser), or a mixture of EML and DML. In other embodiments, the dual-wavelength integrated DML chip can be replaced with a three-wavelength integrated laser chip, in which case the integrated emission TO-CAN 31 can output three emission wavelengths on the same coupled optical path. This TO requires an additional 1 to 2 pins to meet the driving requirements of the second laser. This TO is intended for ONU applications in GPON, XG-PON, and XGS-PON systems (hereinafter referred to as XG(S)-PON).

[0028] In one embodiment, the dual-wavelength integrated DML chip 301 can be a 1286nm / 1270nm integrated dual-wavelength laser chip. Preferably, the 1286nm / 1270nm integrated dual-wavelength laser chip is packaged in a TO-CAN with a cooler to meet the ONU applications of 25G / 50G-PON and XG(S)-PON. In another embodiment, the dual-wavelength integrated DML chip 301 can also be replaced with a 1286nm / 1270nm / 1310nm integrated tri-wavelength laser chip. This 1286nm / 1270nm / 1310nm integrated tri-wavelength laser chip is packaged in a TO-CAN with a cooler to meet the ONU applications of 25G / 50G-PON, XG(S)-PON and GPON. Example

[0029] The XG(S) Combo OLT is backward compatible with GPON and is widely used in carrier networks. This embodiment uses a Combo ONU BOSA in conjunction with it, enabling operators to flexibly manage and upgrade end customers with different needs.

[0030] The structure of a traditional Combo ONU BOSA is as follows: Figure 2As shown, a common 4-TO scheme is adopted, including two independently packaged transmit TX-TOs and two receive RX-TOs.

[0031] This embodiment proposes a new Combo ONU BOSA, such as... Figure 4 As shown, the Combo ONU BOSA includes a dual-wavelength integrated transmit TO-CAN 41 for providing the two wavelength signals required for uplink signals: 2.5G / 10G 1270nm and 1.25G 1310nm; an RX-TO 42 for receiving downlink 10G 1577nm signals; and an RX-TO 43 for receiving downlink 2.5G 1490nm signals. Compared to a conventional Combo ONU BOSA, this embodiment reduces the need for a separately packaged transmit TO and related optical path glass sheets, simplifying the manufacturing process and reducing costs. In another embodiment, the RX-TO 42 for receiving downlink 10G 1577nm signals and the RX-TO 43 for receiving downlink 2.5G 1490nm signals can be replaced with a dual-optical-path dual-receive RX-TO 44. Figure 5 As shown, both the downlink 1577nm and 1490nm signals enter the RX-TO 44, and after passing through the filter glass plate 441, they are split into two optical paths, which are then incident on the detection units 442 and 443 respectively. Using dual receiver TOs can be further simplified to a 2-TO BOSA package, significantly reducing costs.

[0032] This new combination of Combo ONU BOSA and Combo OLT not only helps operators manage end-customer needs but also reduces the design and manufacturing complexity of high-speed OLTs when upgrading to 25G / 50G-PON. Traditional 50G-PON OLTs require backward compatibility with XG(S)-PON and GPON ONUs, necessitating a three-transmit, three-receive design for the OLT, resulting in significant manufacturing difficulties and prominent issues with optical module size, power consumption, and cost, hindering large-scale deployment. Combining with Combo ONU BOSA conveniently solves this problem. For example, in... Figure 6 In the simplified coexistence architecture of the next-generation 50G Combo-PON shown, the 50G PON OLT only needs to be backward compatible with the XG(S)-PON ONU. Traditional GPON users can automatically switch to XG(S) mode via software to continue communicating with the OLT, and the customer's bandwidth can also be flexibly configured through software rate limiting. Therefore, the upgrade management of the ONU by the operator is very convenient, and there is no need to replace the optical modem on-site.

[0033] Variation 1.1 In Variation 1.1, the dual-wavelength integrated transmitter TO-CAN 41 in the Combo ONU BOSA provides the two wavelength signals required for uplink signals: 25G / 50G 1286nm and 2.5G / 10G 1270nm. RX-TO 42 receives the downlink 10G 1577nm signal, and RX-TO 43 receives the downlink 25G / 50G 1342nm signal, thus creating a 25G / 50G ComboONU BOSA. Alternatively, the dual-wavelength integrated transmitter TO-CAN 41 in the Combo ONU BOSA provides the two wavelength signals required for uplink signals: 25G / 50G 1286nm and 2.5G / 10G 1270nm. The dual receiver RX-TO 44 receives the downlink 1342nm and 1577nm signals.

[0034] Variation 1.2 In Variation 1.2, the Combo ONU BOSA includes the dual-wavelength integrated transmit TO-CAN 41 for providing uplink signals at two wavelengths, 2.5G / 10G 1270nm and 1.25G 1310nm, as described in Example 1; the RX-TO 42 for receiving downlink 10G 1577nm signals; and the RX-TO 43 for receiving downlink 2.5G 1490nm signals. It also includes a TX-TO for providing uplink signals at a wavelength of 25G / 50G 1286nm, and an RX-TO for receiving downlink 25G / 50G 1342nm signals.

[0035] Variation 1.3 In Variation 1.3, the Combo ONU BOSA includes the dual-wavelength integrated transmit TO-CAN 41 of Variation 1.1 for providing uplink signals at two wavelengths: 25G / 50G 1286nm and 2.5G / 10G 1270nm; the RX-TO 42 for receiving downlink 10G 1577nm signals; and the RX-TO 43 for receiving downlink 25G / 50G 1342nm signals. It also includes a TX-TO for providing uplink signals at a wavelength of 1.25G 1310nm; and an RX-TO for receiving downlink 2.5G 1490nm signals.

[0036] Variation 1.4 In Variation 1.4, the Combo ONU BOSA includes a three-wavelength integrated transmit TO-CAN for providing uplink signals at three wavelengths: 25G / 50G 1286nm, 2.5G / 10G 1270nm, and 1.25G 1310nm; and three RX-TOs for receiving downlink signals at 25G / 50G 1342nm, 10G 1577nm, and 2.5G 1490nm, respectively. Example

[0037] like Figure 7 As shown, this embodiment provides a novel multi-mode ONU BOSA, including a dual-wavelength integrated transmitter TO-CAN 51 for providing the uplink signals at 2.5G / 10G 1270nm and 1.25G 1310nm wavelengths; and an RX-TO 61 for receiving downlink optical signals at 10G 1577nm and 2.5G 1490nm. These two TOs are assembled using the traditional single-fiber bidirectional BOSA process, employing isolators, filter plates, bases, ferrules, and receptacles. In addition to using a dual-wavelength integrated laser chip and package for transmission, this novel multi-mode ONU BOSA adopts an unconventional single-optical-path design for reception.

[0038] Traditional Combo ONUs have dual optical path receiving optical paths, such as Figure 8 As shown, the downlink 1490nm and 1577nm optical signals emitted from the Combo OLT pass through two filters and are received by two different RX-TOs. The receiver TO61 proposed in this embodiment employs a single-path dual-rate design, such as... Figure 9 As shown, only one RX-TO 61 is needed to receive downlink optical signals at 1577nm and 1490nm. The transimpedance amplifier (TIA) in the RX-TO 61 supports dual rates of 10G and 2.5G.

[0039] Using this novel multi-mode ONU BOSA, as described in this embodiment, can greatly simplify the coexistence requirements during system upgrades and replacements. For example... Figure 10 As shown, when the OLT is upgraded from GPON to XG(S)-PON, the coexistence of GPON and XG(S)-PON ONUs can be achieved without using a Combo OLT. The operating status of the multi-mode ONU BOSA depends on the type of OLT connected (GPON, XG, or XGS-PON), and can be automatically switched in terms of transmit wavelength, rate, and receive rate via software control. After upgrading to 10G, for GPON customers who do not require increased bandwidth, rate limiting can be easily achieved through system software to maintain consistency with the original service bandwidth.

[0040] Variation Example 2.1 In Variation 2.1, the dual-wavelength integrated transmitter TO-CAN 51 in the multi-mode ONU BOSA provides the two wavelength signals required for uplink signals: 25G / 50G 1286nm and 2.5G / 10G 1270nm. RX-TO 61 receives downlink signals at 25G / 50G 1342nm and 10G 1577nm, thus creating a 25G / 50G multi-mode ONU BOSA. The receiver TO61 employs a single-optical-path dual-rate design, and the TIA in RX-TO 61 supports 25G / 50G and 10G rates.

[0041] Variation 2.2 In Variation 2.2, the multi-mode ONU BOSA includes the dual-wavelength integrated transmit TO-CAN 51 from Example 2, which provides uplink signals at 2.5G / 10G 1270nm and 1.25G 1310nm wavelengths; it also includes a TX-TO for providing uplink signals at 25G / 50G 1286nm wavelength, and an RX-TO for receiving downlink signals at 25G / 50G 1342nm, 10G 1577nm, and 2.5G 1490nm. The receive TO employs a single-path, three-rate design, and the TIA in the RX-TO supports 25G / 50G, 10G, and 2.5G rates. In another variation, the multi-mode ONU BOSA includes the dual-wavelength integrated transmit TO-CAN 51 of Embodiment 2 for providing two wavelength signals required for uplink signals: 2.5G / 10G 1270nm and 1.25G 1310nm; it also includes a TX-TO for providing a 25G / 50G 1286nm wavelength signal required for uplink signals, an RX-TO for receiving downlink 1342nm signals, and an RX-TO for receiving downlink 1577nm and downlink 1490nm signals. The RX-TO for receiving downlink 1577nm and downlink 1490nm signals adopts a single-optical-path dual-rate design, and the TIA in the RX-TO supports 10G and 2.5G rates.

[0042] Variation 2.3 In Variation 2.3, the multi-mode ONU BOSA includes the dual-wavelength integrated transmit TO-CAN 51 from Variation 2.1, which provides uplink signals at two wavelengths: 25G / 50G 1286nm and 2.5G / 10G 1270nm. It also includes a TX-TO for providing uplink signals at a wavelength of 1.25G 1310nm; and an RX-TO for receiving downlink signals at 25G / 50G 1342nm, 10G 1577nm, and 2.5G 1490nm. The receive TO employs a single-path, three-rate design, and the TIA in the RX-TO needs to support 25G / 50G, 10G, and 2.5G rates. In another variation, the multi-mode ONUBOSA includes the dual-wavelength integrated transmit TO-CAN 51 of Variation 2.1 for providing uplink signals at two wavelengths: 25G / 50G 1286nm and 2.5G / 10G 1270nm. It also includes a TX-TO for providing uplink signals at a wavelength of 1.25G 1310nm, an RX-TO for receiving downlink 1342nm signals, and an RX-TO for receiving downlink 1577nm and 1490nm signals. The RX-TO for receiving downlink 1577nm and 1490nm signals adopts a single-path dual-rate design, and the TIA in the RX-TO supports 10G and 2.5G rates.

[0043] Variation 2.4 In Variation 2.4, the multi-mode ONU BOSA includes a three-wavelength integrated transmit TO-CAN for providing the three wavelength signals required for uplink signals: 25G / 50G 1286nm, 2.5G / 10G 1270nm, and 1.25G 1310nm; and an RX-TO for receiving downlink signals: 25G / 50G 1342nm, 10G 1577nm, and 2.5G 1490nm. The receive TO employs a single-path, three-rate design, and the TIA in the RX-TO needs to support 25G / 50G, 10G, and 2.5G rates. In another variation, the multi-mode ONU BOSA includes a three-wavelength integrated transmit TO-CAN for providing the three wavelength signals required for uplink signals: 25G / 50G 1286nm, 2.5G / 10G 1270nm, and 1.25G 1310nm; an RX-TO for receiving downlink 1342nm signals; and an RX-TO for receiving downlink 1577nm and 1490nm signals. The RX-TO for receiving downlink 1577nm and 1490nm signals adopts a single-optical-path dual-rate design, and the TIA in the RX-TO supports 10G and 2.5G rates.

[0044] This invention reduces the cost of Combo ONU by employing a multi-wavelength laser chip (outputting at least two wavelengths) and TO packaging technology, further promoting the widespread use of Combo ONUs at the client end, thereby simplifying the upgrade and management of operator FTTX networks.

[0045] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A multi-wavelength integrated PON ONU transmitting TO-CAN, characterized in that, The integrated TO-CAN includes a multi-wavelength integrated laser chip, which can output two emission wavelengths, 1270nm and 1310nm, on the same coupled optical path.

2. A multi-wavelength integrated Combo ONU BOSA, characterized in that, The Combo ONU BOSA includes an integrated transmit TO-CAN as described in claim 1, and two RX-TOs for receiving downlink 1577nm signals and downlink 1490nm signals, respectively; or the Combo ONU BOSA includes an integrated transmit TO-CAN as described in claim 1, and a dual-optical-path dual-receive RX-TO for receiving downlink 1577nm signals and downlink 1490nm signals.

3. The multi-wavelength integrated Combo ONU BOSA as described in claim 2, characterized in that, The Combo ONUBOSA also includes a TX-TO for providing an uplink 1286nm signal and an RX-TO for receiving a downlink 1342nm signal.

4. A multi-wavelength integrated multi-mode ONU BOSA, characterized in that, The multi-mode ONU BOSA includes an integrated transmit TO-CAN as described in claim 1, and an RX-TO for receiving downlink 1577nm signals and downlink 1490nm signals, wherein the RX-TO adopts a single optical path dual-rate design.

5. A multi-wavelength integrated multi-mode ONU BOSA, characterized in that, The multi-mode ONU BOSA includes an integrated transmit TO-CAN as described in claim 1, a TX-TO for providing uplink 1286nm signals, and a first RX-TO for receiving downlink 1577nm, 1490nm, and 1342nm signals, wherein the first RX-TO employs a single-path, three-rate design; or, the multi-mode ONU BOSA includes an integrated transmit TO-CAN as described in claim 1, a TX-TO for providing uplink 1286nm signals, a second RX-TO for receiving downlink 1342nm signals, and a third RX-TO for receiving downlink 1577nm and 1490nm signals, wherein the third RX-TO employs a single-path, dual-rate design.

6. A multi-wavelength integrated PON ONU transmitting TO-CAN, characterized in that, The integrated TO-CAN transmitter includes a multi-wavelength integrated laser chip, which can output two emission wavelengths, 1286nm and 1270nm, on the same coupled optical path.

7. A multi-wavelength integrated Combo ONU BOSA, characterized in that, The Combo ONU BOSA includes an integrated transmit TO-CAN as described in claim 6, and two RX-TOs for receiving downlink 1342nm signals and downlink 1577nm signals, respectively; or the Combo ONU BOSA includes an integrated transmit TO-CAN as described in claim 6, and a dual-receive RX-TO with dual optical paths for receiving downlink 1342nm signals and downlink 1577nm signals.

8. The multi-wavelength integrated Combo ONU BOSA as described in claim 7, characterized in that, The Combo ONUBOSA also includes a TX-TO for providing an uplink 1310nm signal and an RX-TO for receiving a downlink 1490nm signal.

9. A multi-wavelength integrated multi-mode ONU BOSA, characterized in that, The multi-mode ONU BOSA includes an integrated transmit TO-CAN as described in claim 6, and an RX-TO for receiving downlink 1342nm signals and downlink 1577nm signals, wherein the RX-TO adopts a single optical path dual-rate design.

10. A multi-wavelength integrated multi-mode ONU BOSA, characterized in that, The multi-mode ONU BOSA includes an integrated transmit TO-CAN as described in claim 6, a TX-TO for providing uplink 1310nm signals, and a fourth RX-TO for receiving downlink 1342nm, 1577nm, and 1490nm signals, wherein the fourth RX-TO employs a single-path, three-rate design; or, the multi-mode ONU BOSA includes an integrated transmit TO-CAN as described in claim 6, a TX-TO for providing uplink 1310nm signals, a fifth RX-TO for receiving downlink 1342nm signals, and a sixth RX-TO for receiving downlink 1577nm and 1490nm signals, wherein the sixth RX-TO employs a single-path, dual-rate design.

11. A multi-wavelength integrated PON ONU transmitting TO-CAN, characterized in that, The integrated transmission TO-CAN includes a multi-wavelength integrated laser chip, which can output three emission wavelengths of 1286nm, 1270nm and 1310nm on the same coupled optical path.

12. A multi-wavelength integrated Combo ONU BOSA, characterized in that, The Combo ONU BOSA includes an integrated transmit TO-CAN as described in claim 11, and three RX-TOs for receiving downlink 1342nm signals, downlink 1577nm signals, and downlink 1490nm signals, respectively.

13. A multi-wavelength integrated multi-mode ONU BOSA, characterized in that, The multi-mode ONU BOSA includes an integrated transmit TO-CAN as described in claim 11, and a seventh RX-TO for receiving downlink 1342nm signals, downlink 1577nm signals, and downlink 1490nm signals, wherein the seventh RX-TO adopts a single-optical-path three-rate design; or, the multi-mode ONU BOSA includes an integrated transmit TO-CAN as described in claim 11, an eighth RX-TO for receiving downlink 1342nm signals, and a ninth RX-TO for receiving downlink 1577nm signals and downlink 1490nm signals, wherein the ninth RX-TO adopts a single-optical-path dual-rate design.

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